JP2627096B2 - Method and apparatus for pulling out torsion spring - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for pulling out a torsion spring that has been fed to a predetermined pull-out standby position to a predetermined unloading standby position.

(Prior Art) A torsion spring composed of a coil portion and a leg portion extending from the coil portion is incorporated in a video tape cassette or other various products as a simple elastic urging member. When assembling, it is necessary to hold the torsion spring in a predetermined assembling posture according to the torsion spring assembling structure in the product.

For this reason, conventionally, after the torsion spring fed to a predetermined withdrawal standby position is once pulled out to a predetermined unloading standby position in the same posture, when the torsion spring is conveyed from the unloading standby position to a predetermined position in the product, the A method in which the posture of the torsion spring is changed by a transfer device has been generally adopted.

For example, in a process of assembling a torsion spring for a certain type of video tape cassette, the incorporation of a torsion spring has been performed in the following procedure. That is, as shown in FIG. 5, when the torsion spring 2 is fed by the feeding device 100 to a pull-out standby position (a position where the leading end abuts on the stopper 102 urged downward by the spring), FIG. As shown in FIG. 6, which is a view taken along the line VI-VI of FIG. 6, the pair of draw-out chucks 108 of the draw-out mechanism 108 includes a pair of draw-out chucks 106 each having a pin 104 opposed to each other at the tip end. The pair of pins 104 are inserted into the coil part 4 of the torsion spring 2 by rotating the pair of pins 104 in the direction A as shown in FIG. In the direction to the transfer standby position (the position indicated by the solid line in the figure). Next, the torsion spring 2 is lifted upward by the pair of transport chucks 112 of the transport device 110 while holding the outer peripheral portion of the coil portion 4 at the unloading standby position. Then, as shown in FIG. 7, the transfer chuck 112 is rotated by a predetermined angle in the direction C in the drawing to hold the torsion spring 2 in a predetermined installation posture.

In the above conventional example, as shown in FIG.
The feeding of the torsion spring 2 by the feeding device 100 supports the coil portion 4 of the torsion spring 2 on an upper end surface of a linear feeder 114, and a pair of short and long lengths of the torsion spring 2 is provided on both sides of the linear feeder 114. The pulling out of the torsion spring 2 by the pulling-out mechanism 108 is also performed in the same manner as in the first embodiment.
Since the pair of legs 6A and 6B are suspended, the rotation angle of the transport chuck 112 performed at the time of unloading by the transport device 110 depends on the torsion spring 2 and the pair of torsion springs. The angle is set to a necessary angle from the state where the legs 6A and 6B are suspended to the above-described assembled posture.

(Problems to be Solved by the Invention) However, in the conventional torsion spring pull-out method and device, the torsion spring fed to the pull-out standby position is moved to the carry-out standby position in the same posture. After that, before the torsion spring is assembled, the posture of the torsion spring needs to be changed by the rotation of the transport chuck. Therefore, it is necessary to provide a mechanism for rotating the transport chuck in the transport device, which complicates the transport device and increases the weight, which is an obstacle to increasing the speed of incorporating the torsion spring. I was

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a torsion spring pull-out method and apparatus capable of improving productivity by increasing the speed of assembling the torsion spring. is there.

(Means for Solving the Problems) The torsion spring pulling-out method and device according to the present invention are arranged such that when a torsion spring is pulled out, a predetermined guide member is brought into contact with a leg thereof to rotate the torsion spring by a predetermined angle. Thus, the torsion spring can be changed to the installed posture at the stage of completion of the drawer, thereby simplifying and reducing the weight of the transfer device, thereby achieving the above object.

That is, the invention according to claim 1 is a torsion spring pulling-out method for pulling out a torsion spring, which has been fed to a predetermined pull-out standby position and includes a coil portion and a leg extending from the coil portion, to a predetermined unloading standby position. After inserting a pin into the coil portion of the torsion spring at the drawer standby position, by moving the pin in a state where the torsion spring is rotatably supported by the pin, the drawer is performed, At the time of this drawing, a predetermined guide member is brought into contact with the leg portion of the torsion spring to rotate the torsion spring by a predetermined angle.

According to a second aspect of the present invention, there is provided a torsion spring pull-out device for pulling out a torsion spring, which is fed to a predetermined pull-out standby position and includes a coil portion and a leg extending from the coil portion, to a predetermined unloading standby position. A pin having a smaller diameter than the inner diameter of the coil portion of the torsion spring, and inserting the pin into the coil portion of the torsion spring at the pull-out standby position, and then rotating the torsion spring by the pin. A drawer mechanism for pulling out the pin by moving the pin in a state where the pin is supported, and at the time of pulling out by the drawer mechanism, abuts on the leg of the torsion spring to rotate the torsion spring by a predetermined angle. And a guide member for causing it to operate.

Further, in the invention according to claim 3, in the invention according to claim 2, the torsion spring abuts on the torsion spring near the guide member when the rotation exceeds the predetermined angle and the torsion spring is rotated further. A stopper for preventing movement is provided.

According to a fourth aspect of the present invention, in the second aspect of the present invention, a portion of the guide member abutting on the leg of the torsion spring can suppress the rotation of the torsion spring beyond the predetermined angle. It is characterized by being formed in a curved surface shape.

(Operation) As shown in the above configuration, by inserting a pin into the coil portion of the torsion spring at the pull-out standby position, and moving the pin with the pin supporting the torsion spring rotatably, The torsion spring is pulled out, and at the time of this pulling out, a predetermined guide member is brought into contact with the leg of the torsion spring to rotate the torsion spring by a predetermined angle. Thus, the torsion spring can be changed to the installed posture.

(Effects of the Invention) Therefore, according to the present invention, it is not necessary to provide a mechanism for rotating the transfer chuck in the transfer device, and therefore, the transfer device can be simplified and reduced in weight. It is possible to improve productivity by increasing the speed of assembling the torsion spring.

In the torsion spring withdrawing device, a structure is provided in the vicinity of the guide member, wherein a stopper is provided to abut against the torsion spring and prevent further rotation when the torsion spring rotates beyond the predetermined angle. ,
If the portion of the guide member that abuts on the leg of the torsion spring is formed into a curved surface shape capable of suppressing the rotation of the torsion spring beyond the predetermined angle, the pull-out speed of the torsion spring is increased. Even so, excessive rotation of the torsion spring can be effectively prevented, so that productivity can be further improved.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings. The same parts as in FIGS. 5 and 6 showing the conventional example are denoted by the same reference numerals, and the detailed description thereof will be omitted.

FIG. 1 is a drawing showing a torsion spring withdrawing process showing an embodiment of a torsion spring withdrawing method and apparatus according to the present invention.

When the torsion spring 2 is fed by the feeding device 100 to the pull-out standby position, a pair of pull-out chucks 106 of the pull-out mechanism 108 are rotated, and a pair of pins 104 provided at the distal ends of the torsion springs 106 are moved by the torsion. It is inserted into the coil part 4 of the spring 2. After that, the drawer mechanism 108 moves the drawer chuck 106 in the direction B in the drawing, and further moves the drawer chuck 106 to the carry-out standby position in the directions B 'and B "as shown.

During this movement, the torsion spring 2 is rotatably suspended by the pair of pins 104 having a smaller diameter than the inner diameter of the coil part 4 inserted into the coil part 4. In this embodiment, the guide member is moved during the movement of the torsion spring 2.
A guide member 116 is fixed, and the guide member 116 contacts the leg 6B (the shorter leg located forward in the moving direction) of the moving torsion spring 2 to rotate the torsion spring 2 by a predetermined angle. Move. That is, the upper end surface of the guide member 116 is formed with a slope portion 116a which rises forward in the moving direction of the torsion spring 2, and is used when the torsion spring 2 is moved in the directions indicated by B 'and B ". , Its legs 6B
Abuts against the slope 116a, and then the slope 116a
The torsion spring 2 is rotated in the direction D in the figure by causing 116a to follow the tip of the leg 6B. When the movement of the torsion spring 2 is completed, the tip of the leg 6B is brought into contact with the upper horizontal surface 116b formed in front of the slope 116a. The amount of rotation of the torsion spring 2 is
The height is adjusted by appropriately setting the height of the upper horizontal surface portion 116b.

At this time, when the moving speed of the drawer mechanism 108 is increased, the tip of the leg 6B separates from the slope 116a and rotates more than necessary beyond the predetermined angle, and the movement of the drawer mechanism 108 is completed. In some cases, the posture of the torsion spring 2 may not be the desired posture. For this reason, in the present embodiment, as shown in FIG. 1, when the torsion spring 2 rotates beyond the predetermined angle near the slope 116a of the guide member 116, the torsion spring 2 A stopper 150 is provided to abut the torsion spring 2 to prevent the torsion spring 2 from rotating excessively.

Thus, in the present embodiment, the drawer mechanism 10
8, the guide member 116, and the stopper 150 constitute a torsion spring withdrawing device 200.

When the movement of the torsion spring 2 is completed by the draw-out chuck 106, the transfer chuck 112 of the transfer device 110
Descends to clamp the outer peripheral portion of the coil portion 4 of the torsion spring 2 and carry out the torsion spring 2.

The torsion spring 2 thus carried out is incorporated in a lock plate 10 as shown in FIG. 2, and the lock plate 10 is incorporated in a predetermined position of the video tape cassette 12 shown in FIGS. Hereinafter, a structure for assembling the torsion spring 2 and the lock plate 10 in the video tape cassette 12 will be described.

As shown in FIG. 4, the video tape cassette 12 has a magnetic tape 14 on a tape running surface 16a on one end surface of a cassette body 18 in which a magnetic tape 14 is accommodated in a case 16 composed of an upper half 16A and a lower half 16B. A guard panel 22 having a guard portion 20 parallel to the running surface 16a is provided. The guard panel 22 is positioned such that the guard portion 20 can have a closed position covering the magnetic tape 14 on the running surface 16a and an open position exposing the magnetic tape 14 on the running surface 16a. The support shaft 24 provided in the unit is engaged with the hole 26 of the case 16 and is rotatably attached to the cassette body 18.

The lock plate 10 described above is provided in the cassette body 18 to lock the guard panel 22 in the closed position when the cassette is not used. That is, as shown in FIG. 3, the lock plate 10 includes a plate-shaped plate body 28, and first and second protrusions that are implanted in the plate body 28 and project from the plate body 28 in a substantially vertical direction. Part 3
0, 32, and a shaft portion 34 formed integrally with the plate body 28 and extending in the horizontal direction. In a state where the coil portion 4 of the torsion spring 2 is incorporated in the shaft portion 34, It is configured to be mounted in a lock plate mounting portion 36 formed at a side end of the half 16B. Two holes 40 and 42 are formed in the side wall 38 of the lock plate mounting portion 36, and the lock plate 10 engages the protrusions 30 and 32 with the holes 40 and 42, respectively, It is attached to the lock plate mounting part 36. At this time, the torsion spring 2 causes one of the legs (the legs 6B) to abut on the back surface of the plate body 28 (the surface on the opposite side to the projections 30, 32). The other foot is brought into contact with the inner wall surface 44 of the lock plate mounting portion 36 facing the back surface, whereby the protrusions 30 and 32 are urged outward from the holes 40 and 42 to the case. You. By engaging a concave portion 46 engageable with the protrusion 32 on the inner surface of the guard panel 22,
The guard panel 22 is prevented from rotating to the open position and locked to the closed position.

Also, the protrusion 30 is exposed to the outside without being covered by the guard panel 22, and when the video tape cassette 12 is loaded into the cassette deck at the time of use, a member on the deck side pushes the protrusion 30 to press the protrusion 30. The lock plate 10 is pushed into the cassette body 18 to unlock the guard panel 22.

As described above, the lock plate 10 is mounted on the lock plate mounting portion 36 of the cassette main body 18 in a state where the torsion spring 2 is incorporated, but the incorporation of the torsion spring 2 into the lock plate 10 is not performed. , Second
This is performed using a built-in jig 118 as shown in the figure.

The installation jig 118 has a slope 118a inclined at a predetermined angle with respect to a horizontal plane, and a pair of arc-shaped recesses 118b formed on both sides of an upper end of the slope 118a.
The pair of left and right support cylindrical portions 48A and 48B of the lock plate 10 is supported by the arc-shaped concave portion 118b such that the surface of the lock plate 10 is brought into contact with the slope 118a.

The lock plate 10 is set on the installation jig 118, and the lock plate 10 is
Is fixed, the transfer chuck 1 of the transfer device 110
12 is moved in parallel from the carry-out standby position (see FIG. 1), so that the torsion spring 2 is substantially coaxial with the coil portion 4 on the extension axis of the shaft portion 34 of the lock plate 10 as shown in FIG. Convey to the center. Thereafter, the transport chuck 112 is moved in the direction approaching the shaft portion 34 (E in the figure).
), The coil portion 4 of the torsion spring 2 is inserted into the shaft portion 34 of the lock plate 10. After the insertion, the transfer chuck 11
2 is released from the torsion spring 2. As a result, the torsion spring 2 causes the legs 6A and 6B to rotate downward due to its own weight, and the shorter leg 6B
The lock plate main body 28 is located between a pair of positioning projections 50 formed on the back surface of the lock plate 10.
Abut. The transport chuck 112 moves upward after the release of the clamping, and then moves to the carry-out standby position.

The incorporation of the torsion spring 2 into the lock plate 10 is completed as described above. However, when the transport chuck 112 is at the position shown in the figure, the torsion spring 2 has its legs 6A, 6B.
Are gripped by the transport chuck 112 in a substantially horizontal direction, so that when the transport chuck 112 moves in the direction E in the drawing, the legs 6B
There is no interference with the positioning projections 50 of the ten.

As described above in detail, according to the present embodiment, after inserting the pin 104 of the pull-out lever 106 into the coil portion 4 of the torsion spring 2 at the pull-out standby position, the torsion spring is By moving the drawer lever 106 while being rotatably supported, the torsion spring 2 is drawn out,
When pulling out, the leg 6B of the torsion spring 2
The guide member 116 is brought into contact with the torsion spring 2
Is rotated by a predetermined angle, it is possible to change the torsion spring 2 to the built-in posture already at the stage of completing the drawing. Therefore, it is not necessary to provide a mechanism for rotating the transfer chuck 112 in the transfer device 110, so that the transfer device 110 can be simplified and reduced in weight. The productivity can be improved by the conversion.

Moreover, in the present embodiment, since the stopper 150 is provided, even if the pulling speed of the torsion spring 2 is increased, the excessive rotation of the torsion spring 2 can be effectively prevented. Can be improved in productivity.

Instead of the stopper 150 in the present embodiment, the slope 116a of the guide member 116 may be a curved slope 116a 'smoothly connected to the upper horizontal surface 116b, as shown in FIG. It may be. With such a slope portion 116a ', the contact reaction force of the guide member 116 against the torsion spring 2 can be prevented from becoming extremely large.
Over-rotation can be effectively prevented.

In this embodiment, the feeding device 100 for the torsion spring 2 is shown as a vibrating linear feeder in FIG. The feeding device 100 is not limited to the vibrating linear feeder. Further, the guide member 11
6 is also described as being fixed in the present embodiment, but when the tip shape of the transport chuck 112 is special and generates interference with the guide member 116, the guide member 116 is The whole or a part can be movable by a driving means such as an air cylinder.

[Brief description of the drawings]

FIG. 1 is a drawing showing a torsion spring pulling-out process showing an embodiment of a method and a device for pulling out a torsion spring according to the present invention. FIG. 2 is a torsion spring assembly in which the pulled-out torsion spring is incorporated into a lock plate in the above embodiment. FIG. 3 is a view showing a lock plate assembling process in which the lock plate in which the torsion spring is incorporated in the cassette body in the above embodiment, and FIG. 4 is a view showing the arrangement of the torsion spring and the lock plate in the above embodiment. FIG. 5 is a perspective view showing an assembled video tape cassette, FIG. 5 is a view similar to FIG. 1, showing a conventional example, FIG. 6 is a view taken along the line VI-VI of FIG. 5, FIG. FIG. 8 is a diagram showing a torsion spring rotation process which is performed extra when the pulled-out torsion spring is incorporated into the lock plate in the above conventional example, FIG. Shows another embodiment of the present invention, is a view similar to Figure 1. 2 ... torsion spring, 4 ... coil part 6A, 6B ... leg, 10 ... lock plate 12 ... video tape cassette 100 ... feeding device, 102 ... stopper 104 ... pin, 106 ... drawer Chuck 108: Pull-out mechanism, 110: Transport device 112: Transport chuck, 114: Linear feeder 116: Guide member, 116a, 116a ': Slope portion 118: Assembly jig, 150: Stopper 200 …… Drawer device

Claims (4)

(57) [Claims] (1) a sheet is fed to a predetermined drawer standby position;
In a torsion spring pulling-out method for pulling out a torsion spring including a coil portion and a leg portion extending from the coil portion to a predetermined carry-out standby position, after inserting a pin into the coil portion of the torsion spring at the pull-out standby position, By moving the pin in a state where the torsion spring is rotatably supported by the pin, the pull-out is performed. At the time of the pull-out, a predetermined guide member is brought into contact with the leg of the torsion spring. Rotating the torsion spring by a predetermined angle. 2. A sheet is fed to a predetermined drawer standby position.
A torsion spring pulling-out device for pulling out a torsion spring including a coil portion and a leg portion extending from the coil portion to a predetermined carry-out standby position, comprising a pin having a smaller diameter than the inner diameter of the coil portion of the torsion spring. After inserting a pin into the coil portion of the torsion spring at the drawer standby position,
A drawer mechanism for drawing out the pin by moving the pin in a state where the torsion spring is rotatably supported by the pin; and when the drawer mechanism pulls out, the drawer mechanism contacts the leg of the torsion spring. A guide member for rotating the torsion spring by a predetermined angle. 3. A stopper is provided in the vicinity of the guide member so as to abut against the torsion spring when the torsion spring rotates beyond the predetermined angle to prevent further rotation. The torsion spring pull-out device according to claim 2, wherein 4. A portion of the guide member which abuts on the leg of the torsion spring is formed in a curved shape capable of suppressing rotation of the torsion spring beyond the predetermined angle. The torsion spring pull-out device according to claim 2.